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Specify the
Probe Addresses
of two sites (the
Primary
and
Secondary
) that the
console server
is to
ping
to determine if the principal network is still operational
In event of a failure of the principal network the 3G network connection is activated as the access
path to the console server (and its Managed Devices). Only HTTPS and SSH access is enabled
on the failover connection (which should enable the administrator to connect and fix the problem)
Note:
By default, the
console server
supports automatic failure-recovery back to the original state prior
to failover .The
console server
continually pings probe addresses whilst in original and failover
states. The original state will automatically be set as a priority and reestablished following three
successful pings of the probe addresses during failover. The failover state will be removed once
the original state has been re-established.
For earlier firmware that does not support automatic failure-recovery, to restore networking to a
recovered state the following command then needs to be run:
rm -f /var/run/*-failed-over && config -r ipconfig
If required, you can run a custom bash script when the device fails over. It is possible to use this
script to implement automatic failure recovery, depending on your network setup. The script to
create is:
/etc/config/scripts/interface-failover-alert
You can check the connection status by selecting the
Cellular
panel on the
Status: Statistics
menu
o
The
Operational Status
will change as the cellular modem finds a channel and connects to
the network
o
The
Failover & Out-of-Band
screen will display information relating to a configured
Failover/OOB interface and the status of that connection. The IP Address of the Failover/
OOB interface will be presented in the
Failover & Out-of-Band
screen once the
Failover/OOB interface has been triggered
5.7.3
Cellular routing
Once you have configured carrier connection, the cellular modem can be configured to route traffic
through the
console server
. This requires setting up
forwarding
and
masquerading
- as detailed in
Chapter 5.8.
5.7.4
Cellular CSD dial-in setup
Once you have configured carrier connection, the cellular modem can be configured to receive Circuit
Switched Data (CSD) calls.
Note:
CSD is a legacy form of data transmission developed for the TDMA based mobile phone systems
like GSM. CSD uses a single radio time slot to deliver 9.6kb/s data transmission to the
GSM Network and Switching Subsystem where it could be connected through the equivalent of a
normal modem to the Public Switched Telephone Network (PSTN) allowing direct calls to
any dial-up service. CSD is provided selectively by carriers and it is important you receive a
Data
Terminating number
as part of the mobile service your carrier provides. This is the number which
external modems will call to access the console server
Select the
Cellular Modem
panel on the
System: Dial
menu
Check
Enable Dial-In
and configure the
Dial-In Settings
